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// Copyright (c) 2014 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_CRYPTO_COMMON_H
#define BITCOIN_CRYPTO_COMMON_H
#if defined(HAVE_CONFIG_H)
#include <config/bitcoin-config.h>
#endif
#include <cstdint>
#include <cstring>
#include <compat/endian.h>
static inline uint16_t ReadLE16(const uint8_t *ptr) {
uint16_t x;
memcpy((char *)&x, ptr, 2);
return le16toh(x);
}
static inline uint32_t ReadLE32(const uint8_t *ptr) {
uint32_t x;
memcpy((char *)&x, ptr, 4);
return le32toh(x);
}
static inline uint64_t ReadLE64(const uint8_t *ptr) {
uint64_t x;
memcpy((char *)&x, ptr, 8);
return le64toh(x);
}
static inline void WriteLE16(uint8_t *ptr, uint16_t x) {
uint16_t v = htole16(x);
memcpy(ptr, (char *)&v, 2);
}
static inline void WriteLE32(uint8_t *ptr, uint32_t x) {
uint32_t v = htole32(x);
memcpy(ptr, (char *)&v, 4);
}
static inline void WriteLE64(uint8_t *ptr, uint64_t x) {
uint64_t v = htole64(x);
memcpy(ptr, (char *)&v, 8);
}
uint16_t static inline ReadBE16(const uint8_t *ptr) {
uint16_t x;
memcpy((char *)&x, ptr, 2);
return be16toh(x);
}
static inline uint32_t ReadBE32(const uint8_t *ptr) {
uint32_t x;
memcpy((char *)&x, ptr, 4);
return be32toh(x);
}
static inline uint64_t ReadBE64(const uint8_t *ptr) {
uint64_t x;
memcpy((char *)&x, ptr, 8);
return be64toh(x);
}
static inline void WriteBE32(uint8_t *ptr, uint32_t x) {
uint32_t v = htobe32(x);
memcpy(ptr, (char *)&v, 4);
}
static inline void WriteBE64(uint8_t *ptr, uint64_t x) {
uint64_t v = htobe64(x);
memcpy(ptr, (char *)&v, 8);
}
/**
* Return the smallest number n such that (x >> n) == 0 (or 64 if the highest
* bit in x is set.
*/
uint64_t static inline CountBits(uint64_t x) {
#if HAVE_DECL___BUILTIN_CLZL
if (sizeof(unsigned long) >= sizeof(uint64_t)) {
return x ? 8 * sizeof(unsigned long) - __builtin_clzl(x) : 0;
}
#endif
#if HAVE_DECL___BUILTIN_CLZLL
if (sizeof(unsigned long long) >= sizeof(uint64_t)) {
return x ? 8 * sizeof(unsigned long long) - __builtin_clzll(x) : 0;
}
#endif
int ret = 0;
while (x) {
x >>= 1;
++ret;
}
return ret;
}
#endif // BITCOIN_CRYPTO_COMMON_H

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